. and by toyota. and by the alfred p. sloan foundation. supporting science, technology, and improved economic performance and financial literacy in the 21st century. and with the ongoing support of these institutions and foundations. and... this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. captioning sponsored by macneil/lehrer productions captioned by media access group at wgbh access.wgbh.org "the electric company" is brought to you by... find your voice and share it, american greetings, proud sponsor of "the electric company." agreement from the u.s. department of education's ready to learn grant, and viewers like you, thank you. incredible, it's so amazing that it's hard to believe it's true. return -- when something returns, it goes back to where it came from. prove -- if you prove something, you show that it's true, or that it isn't.